COMMISSIONS AND FEES (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Commissions and fees
Total commissions and fees	$ 2,931	$ 2,644	$ 8,627	$ 7,832
Investment banking
Commissions and fees
Total commissions and fees	911	726	2,689	2,053
Trading-related
Commissions and fees
Total commissions and fees	556	519	1,670	1,664
Trade and securities services
Commissions and fees
Total commissions and fees	412	384	1,224	1,176
Credit cards and bank cards
Commissions and fees
Total commissions and fees	406	372	1,081	987
Corporate finance
Commissions and fees
Total commissions and fees	171	164	578	528
Other consumer
Commissions and fees
Total commissions and fees	188	173	521	497
Checking-related
Commissions and fees
Total commissions and fees	121	140	363	360
Loan servicing
Commissions and fees
Total commissions and fees	80	71	254	235
Other
Commissions and fees
Total commissions and fees	$ 86	$ 95	$ 247	$ 332